摘要
为防止山火蔓延、保护森林资源,在林区开设防火线是主要措施之一。但由于比较成熟的、专门用于开设防火线的开沟设备非常少,一般直接采用农用开沟设备进行作业,其开沟效率不高且杂草覆盖效果不好。基于多功能森林消防车,笔者设计了一款能与其相配套使用的三悬架型式的森林防火开沟犁,犁体曲面设计成三片曲率不同的曲面,以适应复杂土质环境,获得良好翻土性能。运用ANSYS软件对开沟犁的静力学、动力学及动力消耗进行了分析。结果表明,最大总体变形0.32 mm发生在犁铧刃口末端;最大应变0.000 2 mm、最大应力34.74 MPa发生在犁柱与犁片焊接最上端。犁体完全入土后土壤平均反力为7.89 k N;开沟犁整机所消耗的平均功率为23.67 k W。通过进行开沟犁的牵引阻力试验,获得单个犁体牵引阻力为6.9 k N,试验值与仿真值基本相符。
Building and maintaining fireline is one of the main measures to prevent the spread of fires and protect the for- est resources. But because of the limited professional and mature fireline construction equipment suited for the rugged needs of the forest industry, the agricultural ploughs are always adopted, which have the disadvantage of low efficiency of trenching and low weed coverage. Based on muhifunctional forest firefighting vehicle, this paper designed a forest fireline plow with three suspension structure and specially designed three different curvature of plow surface in order to adapt to the complex soil environment and achieve good performance in the turning over of the soil. The upper suspension is fixed with firefighting truck while the middle suspension and the below suspension are connected by two springs. In this way, when the blade touched solid objects, the supporting spring can achieve vibration-suppressing effect. The plow furrow o- pener blade was optimized in two conical surface, hyperboloid of one sheet and oblique spiral surface respectively. The statics, dynamics, and power consumption analysis of fireline plow as well as the model of fireline plow cutting soil were analyzed by ANSYS software. The soil characteristics were also analyzed in aspects of the composition of soil, constitutive theory, and the soil model MAT147 （MAT FHWA_SO1L）. From the result of dynamic simulation analysis we can get the effect of cutting soil, three stress nephogram, and the force of soil reaction during cutting process respectively. The results showed that the maximum total deformation which occurred at the end of the plough share edge is 0. 32 ram. Maxi- mum strain with 0. 000 2 mm and maximum stress with 34. 74 MPa which occurred in the welding upper between plow pole. The average counter force is 7. 89 kN when plow body is completely buried in soil and the average power consump- tion of fireline plow is 23.67 kW. Single plow traction resistance is 6.9 kN by the fireline plow traction resistance test. The simulation results are basically agreed with the test value.
出处
《林业工程学报》
北大核心
2016年第4期118-123,共6页
Journal of Forestry Engineering
基金
国家林业公益性行业科研专项(201304405)
江苏高校优势学科建设工程资助项目(PAPD)
关键词
森林防火
开沟犁
ANSYS分析
动力消耗
forest fire prevention
fireline plow
ANSYS analysis
power consumption
